User authentication control using ultrasound

Present teachings relate to a method for initiating an authentication process on an electronic device, the method comprising transmitting an ultrasound signal from an ultrasound transmitter, generating a measured signal by receiving at an ultrasound receiver an echo of the ultrasound signal being reflected by an object, analyzing the echo by processing the measured signal, and initiating the authentication process on the electronic device based on the processing of the measured signal. The present teachings also relate to a method for maintaining an authenticated state of an object. The present teachings also relate to an electronic device comprising an ultrasound system for initiating an authenticating process. The present teaching also relate to an electronic device comprising an ultrasound system for retaining an authenticated state of an object. The present teachings also relate to a computer software product for implementing any method steps disclosed herein. 本教导涉及一种用于在电子设备上发起认证过程的方法，该方法包括：从超声发射器发射超声信号；通